I haven't installed Canon drivers in a while, but you should be able to select "Add A Printer", complete installation of the driver to LPT1 port, then "Add A Port" and specify the IP address desired.
If that doesn't work you may have some network issue preventing you from connecting to the printer. Try pinging it, or browsing to the printers webpage to confirm that the printer is on the network. =^..^=
If that doesn't work you may have some network issue preventing you from connecting to the printer. Try pinging it, or browsing to the printers webpage to confirm that the printer is on the network. =^..^=